android: imageview inside button

In your xml layout for the button, add:

<Button
  ...
  android:drawableLeft="@drawable/myIcon"
  android:drawablePadding="5dp"
  android:paddingLeft="10dp"
  android:text="My text" />

Where myIcon.png is your icon in the drawable folder.

EDIT Added padding. EDIT 2: Added padding to left of the icon.